Please look at the attached CAPX file to see what I mean. Currently the enemy tank is set up to move towards player 1 (controlled by arrow keys) when player one is in line of site. I have two issues:1) The tank often moves through the solid walls instead of going around2) Sometimes only one enemy tank seems to discover player 1

Because the process is temperamental you may need to refresh the screen a couple of times until you see it happen.

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I haven't looked at you're capx yet, but make sure that solid walls have solid behavior. and for tanks attacking you got to make them to be a group trough variable and then with events make that group move together if one of them has player in sight.

I think this has to due with your cell size. Your walls/blocks are multiples of 44(ish) but your pathfinding cells are 30+6, so 40. I would suggest sizing everything appropriately, turning on the grid, aligning with the grid, so that everything is lined up with the grid. Reread the documentation on the cell mechanism. I did a quick experiment and it did seem to improve (I did see the overlaps you were seeing prior to these changes.)